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Zenith Automatic Transfer Switch | new.abb.com/low-voltage
Figure S6-23: Connection Points for Universal Transformer Assembly (UTA)
Note 1: Both Aux inputs (120VAC and 24VDC) must be supplied from an uninterrupted power source. Supplying only one Aux input may result in malfunction.
Figure S6-24: Connection Points on Test Plug for Universal Transformer Assembly (UTA)
Plug Position
Test Point
Test Connection Points
Value Measured
1
TP10
TP1-TP2
Line AC Voltage Input from Source 1
2
–
TP2-TP3
Voltage Drop Across R1
3
TP8
TP4-TP5
24 VAC to Output from Source 1 to Input/Output Relays
4
–
TP6-TP7
Line AC Voltage Input from Source 2
5
TP6
TP7-TP8
Voltage Drop Across R2
6
–
TP9-TP10
24 VAC to Output from Source 2 to Input/Output Relays
7
TP4
8
–
9
TP2
10
–
11
–
12
TP9
13
–
14
TP7
15
–
16
TP5
17
–
18
TP3
19
–
20
TP1
Plug Position
Test Point
20
TP1
19
18
TP3
17
16
TP5
15
14
TP7
13
12
TP9
11
Plug Position
Test Point
10
9
TP2
8
7
TP4
6
5
TP6
4
3
TP8
2
1
TP10
View Looking Into Plug
120VAC Aux Input
(Customer Supplied) (Not Obligatory)
(See Note 1)
UTA
Metal
Cover
170VDC Output
from UTA to
MX350 Controller
UTA PC Board
Test Points
Source 1
Voltage Input
24 VDC Output from
UTA to I/O relays
24VDC Aux Input (Ungrounded)
(Customer Supplied) (Not Obligatory)
(See Note 1)
Source 2
Voltage Input